diff --git a/shell.nix b/shell.nix
index 401e4d0..c973c9c 100644
--- a/shell.nix
+++ b/shell.nix
@@ -6,8 +6,9 @@ mkShell {
   buildInputs = [
     python38
     python38Packages.telethon
-    python38Packages.aiosmtpd
     python38Packages.pytest
+    python38Packages.isort
+    python38Packages.pyflakes
   ];
 
 }
diff --git a/src/notifier.py b/src/notifier.py
index c66a043..1e47ef3 100644
--- a/src/notifier.py
+++ b/src/notifier.py
@@ -1,7 +1,8 @@
 from email.message import EmailMessage
-from smtplib import SMTP_SSL
-from constants import DOMAIN, USERNAME, PASSWORD
 from secrets import token_hex
+from smtplib import SMTP_SSL
+
+from constants import DOMAIN, PASSWORD, USERNAME
 
 
 def initialize_smtp(domain, username, password):